WEBP_REDUCE_SIZE: disable all rescaler code

BUG=webp:355

Change-Id: Id87cb11902e3fb8544a214308526ea9665ce8440
(cherry picked from commit 0df22b9eed)

src/dec/buffer_dec.c

@@ -194,7 +194,9 @@ VP8StatusCode WebPAllocateDecBuffer(int width, int height,
       width = cw;
       height = ch;
     }
+
     if (options->use_scaling) {
+#if !defined(WEBP_REDUCE_SIZE)
       int scaled_width = options->scaled_width;
       int scaled_height = options->scaled_height;
       if (!WebPRescalerGetScaledDimensions(
@@ -203,6 +205,9 @@ VP8StatusCode WebPAllocateDecBuffer(int width, int height,
       }
       width = scaled_width;
       height = scaled_height;
+#else
+      return VP8_STATUS_INVALID_PARAM;   // rescaling not supported
+#endif
     }
   }
   buffer->width = width;

src/dec/io_dec.c

@@ -241,6 +241,7 @@ static int EmitAlphaRGBA4444(const VP8Io* const io, WebPDecParams* const p,
 //------------------------------------------------------------------------------
 // YUV rescaling (no final RGB conversion needed)
 
+#if !defined(WEBP_REDUCE_SIZE)
 static int Rescale(const uint8_t* src, int src_stride,
                    int new_lines, WebPRescaler* const wrk) {
   int num_lines_out = 0;
@@ -541,6 +542,8 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
   return 1;
 }
 
+#endif  // WEBP_REDUCE_SIZE
+
 //------------------------------------------------------------------------------
 // Default custom functions
 
@@ -561,10 +564,14 @@ static int CustomSetup(VP8Io* io) {
     WebPInitUpsamplers();
   }
   if (io->use_scaling) {
+#if !defined(WEBP_REDUCE_SIZE)
     const int ok = is_rgb ? InitRGBRescaler(io, p) : InitYUVRescaler(io, p);
     if (!ok) {
       return 0;    // memory error
     }
+#else
+    return 0;   // rescaling support not compiled
+#endif
   } else {
     if (is_rgb) {
       WebPInitSamplers();

src/dec/vp8l_dec.c

@@ -485,6 +485,7 @@ static int ReadHuffmanCodes(VP8LDecoder* const dec, int xsize, int ysize,
 //------------------------------------------------------------------------------
 // Scaling.
 
+#if !defined(WEBP_REDUCE_SIZE)
 static int AllocateAndInitRescaler(VP8LDecoder* const dec, VP8Io* const io) {
   const int num_channels = 4;
   const int in_width = io->mb_w;
@@ -516,10 +517,13 @@ static int AllocateAndInitRescaler(VP8LDecoder* const dec, VP8Io* const io) {
                    out_width, out_height, 0, num_channels, work);
   return 1;
 }
+#endif   // WEBP_REDUCE_SIZE
 
 //------------------------------------------------------------------------------
 // Export to ARGB
 
+#if !defined(WEBP_REDUCE_SIZE)
+
 // We have special "export" function since we need to convert from BGRA
 static int Export(WebPRescaler* const rescaler, WEBP_CSP_MODE colorspace,
                   int rgba_stride, uint8_t* const rgba) {
@@ -561,6 +565,8 @@ static int EmitRescaledRowsRGBA(const VP8LDecoder* const dec,
   return num_lines_out;
 }
 
+#endif   // WEBP_REDUCE_SIZE
+
 // Emit rows without any scaling.
 static int EmitRows(WEBP_CSP_MODE colorspace,
                     const uint8_t* row_in, int in_stride,
@@ -746,9 +752,12 @@ static void ProcessRows(VP8LDecoder* const dec, int row) {
       if (WebPIsRGBMode(output->colorspace)) {  // convert to RGBA
         const WebPRGBABuffer* const buf = &output->u.RGBA;
         uint8_t* const rgba = buf->rgba + dec->last_out_row_ * buf->stride;
-        const int num_rows_out = io->use_scaling ?
+        const int num_rows_out =
+#if !defined(WEBP_REDUCE_SIZE)
+         io->use_scaling ?
             EmitRescaledRowsRGBA(dec, rows_data, in_stride, io->mb_h,
                                  rgba, buf->stride) :
+#endif  // WEBP_REDUCE_SIZE
             EmitRows(output->colorspace, rows_data, in_stride,
                      io->mb_w, io->mb_h, rgba, buf->stride);
         // Update 'last_out_row_'.
@@ -1632,12 +1641,19 @@ int VP8LDecodeImage(VP8LDecoder* const dec) {
 
     if (!AllocateInternalBuffers32b(dec, io->width)) goto Err;
 
+#if !defined(WEBP_REDUCE_SIZE)
     if (io->use_scaling && !AllocateAndInitRescaler(dec, io)) goto Err;
 
     if (io->use_scaling || WebPIsPremultipliedMode(dec->output_->colorspace)) {
       // need the alpha-multiply functions for premultiplied output or rescaling
       WebPInitAlphaProcessing();
     }
+#else
+    if (io->use_scaling) {
+      dec->status_ = VP8_STATUS_INVALID_PARAM;
+      goto Err;
+    }
+#endif
     if (!WebPIsRGBMode(dec->output_->colorspace)) {
       WebPInitConvertARGBToYUV();
       if (dec->output_->u.YUVA.a != NULL) WebPInitAlphaProcessing();

src/dsp/rescaler.c

@@ -209,7 +209,7 @@ static volatile VP8CPUInfo rescaler_last_cpuinfo_used =
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInit(void) {
   if (rescaler_last_cpuinfo_used == VP8GetCPUInfo) return;
-
+#if !defined(WEBP_REDUCE_SIZE)
 #if !WEBP_NEON_OMIT_C_CODE
   WebPRescalerExportRowExpand = WebPRescalerExportRowExpand_C;
   WebPRescalerExportRowShrink = WebPRescalerExportRowShrink_C;
@@ -252,6 +252,6 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInit(void) {
   assert(WebPRescalerExportRowShrink != NULL);
   assert(WebPRescalerImportRowExpand != NULL);
   assert(WebPRescalerImportRowShrink != NULL);
-
+#endif   // WEBP_REDUCE_SIZE
   rescaler_last_cpuinfo_used = VP8GetCPUInfo;
 }

src/dsp/rescaler_mips32.c

@@ -13,7 +13,7 @@
 
 #include "src/dsp/dsp.h"
 
-#if defined(WEBP_USE_MIPS32)
+#if defined(WEBP_USE_MIPS32) && !defined(WEBP_REDUCE_SIZE)
 
 #include <assert.h>
 #include "src/utils/rescaler_utils.h"

src/dsp/rescaler_mips_dsp_r2.c

@@ -13,7 +13,7 @@
 
 #include "src/dsp/dsp.h"
 
-#if defined(WEBP_USE_MIPS_DSP_R2)
+#if defined(WEBP_USE_MIPS_DSP_R2) && !defined(WEBP_REDUCE_SIZE)
 
 #include <assert.h>
 #include "src/utils/rescaler_utils.h"

src/dsp/rescaler_msa.c

@@ -13,7 +13,7 @@
 
 #include "src/dsp/dsp.h"
 
-#if defined(WEBP_USE_MSA)
+#if defined(WEBP_USE_MSA) && !defined(WEBP_REDUCE_SIZE)
 
 #include <assert.h>
 

src/dsp/rescaler_neon.c

@@ -13,7 +13,7 @@
 
 #include "src/dsp/dsp.h"
 
-#if defined(WEBP_USE_NEON)
+#if defined(WEBP_USE_NEON) && !defined(WEBP_REDUCE_SIZE)
 
 #include <arm_neon.h>
 #include <assert.h>

src/dsp/rescaler_sse2.c

@@ -13,7 +13,7 @@
 
 #include "src/dsp/dsp.h"
 
-#if defined(WEBP_USE_SSE2)
+#if defined(WEBP_USE_SSE2) && !defined(WEBP_REDUCE_SIZE)
 #include <emmintrin.h>
 
 #include <assert.h>